In a skillet or wok, heat the oil over medium-high heat. Stir in the onion, ginger, and garlic, and cook until lightly browned. Mix in chicken strips, and cook about 3 minutes, until browned. Stir in the coconut milk sauce. Continue cooking until sauce is reduced be about 1/3. Mix in mushrooms, green onions, and basil, and cook until heated through. Serve over the cooked rice.